Mods please move if you don't think it belongs
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Those errors might be right, If a sensor goes out, the ecu freaks out. I had a coolant temp sensor go out on my truck, and my truck was acting sluggish, so I changed out the sensor, had the error light reset, and she runs like new. It's wierd how little things can really screw everything up on a car.

Really? A bad sensor can cause shaking, crap fuel economy and a loud engine?? Sooo bizarre..
________________________All that I'm after is a life full of laughterAs long as I'm laughin' with youI'm thinkin' bout all that still matters is a love ever afterAfter the life we've been through, yeahKnow there's no life after you

LOL I don't think so, I always fill up at the usual place right by where I live.
________________________All that I'm after is a life full of laughterAs long as I'm laughin' with youI'm thinkin' bout all that still matters is a love ever afterAfter the life we've been through, yeahKnow there's no life after you

Which O2 sensor did you replace? There are two on this model. According to the first code, the pre catalyist sensor needs to be replaced. Once that is done, the second code will probably drop off, too. You must have the computer recycled in order for the code and symptons to go away after repair.
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If you don't look around you'll never knowIf you don't step up you'll never knowIf you don't jump off you'll never knowand you'll never find another lifeBroken Circle-Sam Phillips

carsntunes.:Which O2 sensor did you replace? There are two on this model. According to the first code, the pre catalyist sensor needs to be replaced. Once that is done, the second code will probably drop off, too. You must have the computer recycled in order for the code and symptons to go away after repair.

2 O2 sensors eh? How many Air fuel sensors?
________________________All that I'm after is a life full of laughterAs long as I'm laughin' with youI'm thinkin' bout all that still matters is a love ever afterAfter the life we've been through, yeahKnow there's no life after you

Just one Mass Air Flow Sensor. All cars from 1996 to current have at least two O2 sensors, one pre catalyst and one post catalyst. Cars with two banks of cylinders (ie V6, V8) have four O2 sensors! Toyotas are also noted for catalytic converter failures as well.
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If you don't look around you'll never knowIf you don't step up you'll never knowIf you don't jump off you'll never knowand you'll never find another lifeBroken Circle-Sam Phillips

I have a '99 camry xle and there are three sensors. the B1S1 is in the middle of the other two, one which is at the front of the engine and the other nearer the catalytic converter. In order to find/replace the B1S1, which is at the rear of the engine, you have to jack up the car to access it. Generally speaking, they seem to go on or about the same time. Hope this helps. I am dealing with a similar problem and would like to hear how your situation works out. Thanks.